Probability

Unit 6: Probability

Lesson 3: Making Predicitons

Vocabulary

• Relative Frequency: is the ratio of the number of experimental successes to the total number of experimental attempts.

Event: Rolling a Pair of Dice

• Dice 1: Green

• Dice 2: Red

Theoretic Probability Formula

• Number of Favorable or Desired Outcomes

• Total Number of Possible Outcomes

• Ex: The theoretical probability of rolling a "2".

• P(2) = 1 / 6

Multiple Choice

What is the Theoretical probability of rolling a pair of dice and landing on doubles? P(Doubles) = ?

• 1/36

• 1/12

• 1/6

• 1/9

Making predictions with theoretical data.

• Set up a proportion

• Solve using one of two methods:

• Cross Multiply

• Scaling Up

Multiple Choice

How many times would you expect doubles to be rolled if you rolled 50 times?

• I expect to see doubles about 8.3 times

• I expect to see doubles about 7 times

• I expect to see doubles about 10 times

• I expect to see doubles about 5 times

Experimental Probability Formula

• Number of Successful attempts

• Total Number of Trails/attempts

• Ex: John flipped a coin 100 times, it lands on heads 49 times.

• Experimental Probability: 49 / 100

Multiple Choice

What is the experimental probability of rolling doubles if you rolled two dices 50 times, and got doubles 7 times?

• 7/15

• 7/50

• 7/10

• 1/2

Poll

• 1: I don't Understand It. I need Help

• 2: I think I'm getting it, but I'm still a little confused

• 3: I understand It

• 4: I understand It! i could teach this to someone else.